SURFACE ANATOMY?

Again, reading through my anatomy and of course with the indispensable atlas of the human body and just decided to scribble an image on paper anf here's the result.

Supposed to be surface anatomy showing most palpable muscles and structures of the thorax (that's the upper trunk) but it doesn't look so much, i guess so much superhero movies have made it look like the natural body is a clothing of it's own, LoL.

Picture taken with my phone, TECNO POP5

Now, looking at this image, i feel posting just the final look doesn't do justice to the work that was put into this. Guess I'd have to include stepwise images of the drawing next time.

And this is was my first time of trying a drawing on this scale with a pen. I'm quite impressed myself.

Please, do drop your thoughts on the sketch as a comment. Thanks